the most heated exchange of the day came from a former close friend, senator john mccain who grilled hagel on opposing the 2007 u.s. troop surge in iraq. >> wiere you correct or incorret when you said that the surge would be the most dangerous foreign policy blunder in this country since vietnam? were you correct or incorrect? yes or no? >> my reference to -- >> are you going to answer the question, senator hagel? the question is, were you right or wrong. that's a pretty straight forward question. >> well, i -- >> i would like the answer whether you're right or wrong and then you're free to elaborate. >> well, i'm not going to give you a yes or no answer. >> well, let the record show you refuse to answer that question. please go ahead. >> well, if you would like me to explain why -- >> actually, i would like an answer, yes or no? >> well, i'm not going to give you a yes or no. it's far more complicated than that. my answer is i'll defer that judgment to history. >> i think history has already made a judgment about the surge, sir. and you're on the wrong side of it. >> hagel was also